Abstract
Changes in extractable gibberellin like activity have been followed in corms of saffron plant (Crocus sativus L.) during dormancy and sprouting. Extracts prepared from dormant corms in May and June lacked gibberellin like activity. Detectable though feeble activity appeared in July and increased thereafter reaching a maximum in September. Although the activity decreased somewhat in October and November it spread over a wider zone on the TLC plates suggesting a change in the spectrum of active components. At each of the seven stages, activity was present only in the free acidic fraction. No activity was found to be associated with the bound fraction. Preliminary characterisation of gibberellin like compounds at one stage (in September) suggests the presence of five to six gibberellins one of which corresponds to GA3 and another to unresolved GA4 and GA7.
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